说明：  实现计算器的功能: 1、二进制、八进制、十进制及十六进制数的加、减、乘、除、乘方、取模等简单计算 2、科学计算函数，包括[反]正弦、[反]余弦、[反]正切、[反]余切、开方、指数等函数运行 3、以角度、弧度两种方式实现上述部分函数 4、具备历史计算的记忆功能 5、对不正确的表达式能指出其错误原因
(Implementation calculator functions: one, binary, octal, decimal and hexadecimal number of add, subtract, multiply, divide, involution, such as easy calculation of modulus 2, scientific computing function, including the [Anti-] sinusoidal, [anti- ] cosine, [anti-] tangent, [anti-] Cotangent, prescribing, the index function, such as running 3 to the angle of curvature of two ways to achieve the above-mentioned part of function 4, with the history of computing and memory function 5, the incorrect expression can point out the reasons for their errors)